Rolling-mill



Patented Apr. Il, |899. E. W. G. C. HOFFMANN.

RDLLING MILL;

(Application led. 12, 198.)

(NoModel.)

q l N m N l i l f! 1w!! IAI lII N x1.| m I, Q N l ,UNITED STATES iPATENT OFFICE.

ERNST IVILHELM GUSTAV CARL HOFFMANN, OF CHARLOTTEN BURG, GER- MANY,ASSIGNOR TO THE SIEMENS da HALSKE ELECTRIC COMPANY OF AMERICA, OFCHICAGO, ILLINOIS.

ROLLING-MILL.

Y srEcrFIcA'rIoN forming part of Letters Patent No. 622,801, dated April1 1, 1899'.

Application filed December 12, 1898. Serial No. 698,989. (No model.)

u seful Improvement in Rolling-Mills, of which the following is a full,clear, concise, and eX- act description.

. My invention relates to improvements in rolling-mills adapted for thecompression of granular or pulverized materials, and has for its objectthe provision of simple and highlyeffective means for accomplishing saidresult.

It has previously been found necessary in effecting the compression andcohesion of granular or pulverized substances-such as carbon, forexample-to employ rollers of eX- tremely large diameter in order to`secure large contact-surfaces and prevent the material from being.forced backward by the rollers, whereby insufficient compression and aninferior completed product result. In order to overcome this, the millsor rolling-machines for rolling many classes of comminuted materialcommonly are constructed of considerable size and unnecessary weight inorder to overcome the disadvantage above alluded to. It will readily beappreciated that in a large machine the tendency of the rollers duringthe operation to force the treated material backward is largely doneaway with, since the curvature of their surfaces is comparatively slightanda relatively large area for the engagement of the rolled product isprovided. In accordance'with' my present invention I have been enabledto secure the same advantageous results with smaller and lessexpensivemachines than have previously been em ployed.

I may briefly describe` the rolling or compression mill of my inventionas consisting of a hollow drum wherein the pressure roller 0r rollersare eccentrically disposed, the treated material being compressedbetween the inner face of the drum and the; peripheries `of the saidroller or rollers.

My invention will be more readily understood byreference to theaccompanying drawings, wherein- Figure lis a side view of myimprovedmachine, sllown partially in section, illustrating annular channel b,Within which the disk d of the compression-roller d closely fits. Thecompression-roller is eccentrically` mounted in the machine with respectto the coacting rotatable drum. Gear-wheels e and e' are provided,respectively, for driving the drum and the compression-roller shaft, thesame preferably being constructed to secure the rotation of the drum and-disk in the direction of the arrows, (see Fig. 1,) so that themovements of the treated product and of the compression-disk d' at theirengaging surfaces f will be equal. Granular carbon, for example, beingfed into the mill at g, it will be seen that the same is graduallycompressed between the interior surface of the drum and thecircumference of the pressure-disk d substantially throughout thequadrant of a circle. The tendency ofthe material under thepressure-roller to be forced backward is overcome by the constructionshown, and the carbon is compressed with any desired force within theannular channel b', from which it may be removedfrom the machineupon thefarther side of the roller by any suitable means.

To assist in effecting the compression of the treated substance, Ipreferably provide a heavy cylindrical part cl2 upon the shaft of thecompression-roller d, the weight thereof .coacting with the pressuresecured through the bearings of the shaft.

1t is obvious that alterations may be made in the machine hereinspecifically described and shown, and I do not desire to be understoodas limiting myself to the precise details thereof; but,

- IIaving 110W explained my invention, what I claim as new, and desireto secure by these Letters Patent, is-

l. In a machine of the class described, the combination with a channeleddrum, of a compression-roller eccentrically mounted Within said drum andhaving its effective 'periphery lying Within the channel, and means forsup: porting and for rotating the said roller and drum, substantially asdescribed.

2'. In a rolling-mill of the class described, the combination With arotatable drum b provided with a channel b' wherein the material isacted upon, of a compression-roller d eccentrically mounted in the drumin position to engage the material Within the channel,- rollers'a aadapted to support the drum, and means for rotating the roller and drumin the same direction and substantially at the same speed, substantiallyas described.

3. In a rolling-mill for eiecting the combination with a drum b, of acoacting compression-roller d eccentrically disposed Within said drum,supporting-rollers a a, and means for effecting Y,the rotation of thedrum and roller, substantially as described..

4. In a rolling-mill of the class. described; the combination With adrum rotatably mounted upon the supporting-rollers@ a., of a coactingcompression-roller d eccentrically mounted therein, and mechanismforrotat-V ing the said drum and roller, whereby the rotatorjT movementsof the roller and of the treated material at point f are equal,-substantially as described.

In Witness whereof I hereunto subscribe my name this 14th day ofNovember, A. D. 1898.

ERNST WILHELM GUSTAV CARL HOFFMANN.

Witnessesi PAUL ROEDIGER, E. L. GoLDsoHMIDT.

